﻿/***********************************************************************************\
| Copyright (c) 2011, Bashar Al-Rawi                                                |
| All rights reserved.                                                              |
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using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Reflection;
using System.IO;
using System.Xml.Linq;
using System.Linq;
using System.Text.RegularExpressions;
using System.Globalization;
using System.Collections.Generic;

namespace Arabic.Utils
{
    public class KeyCodeHelper
    {
        private static IDictionary<int, string> codeToChar;
        private static IDictionary<string, int> charToBase;
        
        static KeyCodeHelper()
        {
            codeToChar = new Dictionary<int, string>();
            charToBase = new Dictionary<string, int>();
            Assembly assembly = typeof(ArabicCharacter).Assembly;
            using (Stream xmlStream = assembly.GetManifestResourceStream("Arabic.Utils.Characters.xml"))
            {
                XDocument document = XDocument.Load(xmlStream);
                ParseKeys(document);
            }

        }

        private static void ParseKeys(XDocument document)
        {
            var keys = from key in document.Descendants("Key")
                       select key;
            Regex rx = new Regex(@"\\[uU]([0-9A-F]{4})");

            foreach (var key in keys)
            {
                int id = int.Parse(key.Attribute("PlatformCode").Value);
                int baseId = 0;

                string ch = rx.Replace
                    (
                        key.Attribute("Display").Value,
                        delegate(Match match)
                        {
                            baseId = Int32.Parse(match.Value.Substring(2), NumberStyles.HexNumber);
                            return ((char)baseId).ToString();
                        }
                    );

                codeToChar.Add(id, ch);
                charToBase.Add(ch, baseId);
                
            }
            
        }
        public static string Translate(int platformKeyCode)
        {
            return codeToChar[platformKeyCode];
        }

        public static int? Translate(string displayCh)
        {
            if (!charToBase.ContainsKey(displayCh))
                return null;
            return charToBase[displayCh];
        }
    }
}
